While we usually hear about environmental problems and the difficulty of finding soluions, SourceCode takes a look at some sustainable alternatives. We'll show you the largest urban garden in America in South Central LA, and their struggle to keep their farm alive. Then, come to San Francisco, where the city government has decided to implement the precautionary principle in their decison making. And across the Bay Bridge, see how the collaboration of national, regional, and grassroots organizations is creating a new model for urban solutions. And we'll show you an excerpt from Brian Dystra's new play Clean Alternatives.